Sofa



FIG. 1 is a perspective view of a sofa showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, the right side being a mirror image;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof in a different embodiment that includes pillows. 

CLAIM The ornamental design for a sofa, as shown and described. 